MANUAL OF THE GRASSES OF THE UNITED STATES 929 



Poa dinantha Wood, Class-book 797. 1861. Montgomery, Ala. 

 This species was described as Poa nemoralis L., in Torr., Fl. North, and Mid. 

 U.S. 1: 111. 1823. 

 (64) Poa arapla Merr., Rhodora 4: 145. 1902. Steptoe, Wash., G. R. Vasey 



3009. 



Poa laeviculmis Williams, Bot. Gaz. 36: 55. 1903. Several specimens from 

 Washington and Oregon mentioned, the first being Steptoe, Wash., G. R. 

 Vasey 3026. 

 Poa truncata Rydb., Bull. Torrey Bot. Club 32: 607. 1905. Dillon, Colo., 



Clements 373. 

 Poa confusa Rydb., Bull. Torrey Bot. Club. 32 : 607. 1905. Medicine Bow 



Mountains, Wyo., Nelson 7787. 

 (5) Poa annua L., Sp. PL 68. 1753. Europe. 



Air a pumila Pursh, Fl. Amer. Sept. 1: 76. 1814. Pennsylvania. 



Poa infirma H.B.K., Nov. Gen. and Sp. 1: 158. 1816. Colombia, Humboldt 



and Bonpland. 

 Megastachya infirma Roem. and Schult., Syst. Veg. 2: 585. 1817. Based on 



Poa infirma H.B.K. 

 Catabrosa pumila Roem. and Schult., Syst. Veg. 2: 696. 1817. Based on Air a 



pumila Pursh. 



Poa aestivalis Presl, Rel. Haenk. 1: 272. 1830. Peru, Haenke. 

 Eragrostis infirma Steud., Nom. Bot. ed. 2. 1: 563, 1840. Based on Poa 



infirma H.B.K. 

 Poa annua var. rigidiuscula L. H. Dewey, Contrib. U.S. Natl. Herb. 3: 262. 



1895. Nez Perce County, Idaho, Sandberg 134. 

 (7) Poa arachnifera Torr., in Marcy, Expl. Red Riv. 301. 1853. Headwaters of 



the Trinity River [Ark., Marcy Exped.]. 

 Poa densiflora Buckl., Acad. Nat. Sci. Phila. Proc. 1862: 96. 1863. Northern 



Texas. 



Poa arachnifera var. glabrata Vasey, Descr. Cat. Grasses U.S. 79. 1885, name 

 only, [for staminate plants with glabrous spikelets]; Vasey; Beal, Grasses 

 N.Amer. 2: 535. 1896. [Texas, Buckley in 1881.] 

 Poa glabrescens Nash, in Small, Fl. Southeast. U.S. 154, 1327. 1903. Based 



on P. arachnifera var. glabrata Torr. (error for Vasey) . 

 (21) Poa arctica R. Br., Sup. App. Parry's Voy. 288 (err. typ. 188). 1823. 



Melville Island, Arctic America, Parry. 

 Poa gray ana Vasey, Contrib. U.S. Natl. Herb. 1: 272. 1893. Grays Peak, 



Colo., Patterson 14 in 1885. 



Poa laxa occidentalis Vasey; Rydb. and Shear, U.S.Dept.Agr., Div. Agrost. 

 Bull. 5: 32. 1897. Name only, for Shear 690 and Rydberg 2440, Grays 

 Peak, Colo. 

 Poa longipila Nash, in Rydb., Mem. N.Y. Bot. Gard. 1:46. 1900. Electric 



Peak, Yellowstone Park, Rydberg 3614. 



Poa alpicola Nash, in Rydb., Mem. N.Y. Bot. Gard. 1:47. 1900. Based on 

 P. laxa Haenke as misapplied by Thurber (in Watson, Bot. Calif. 2: 312. 

 1880). 

 Poa williamsii Nash, Bull. N.Y. Bot. Gard. 2: 156. 1901. White Pass, 



Alaska, Williams in 1899. 

 Poa aperta Scribn. and Merr., U.S.Dept.Agr., Div. Agrost. Circ. 35: 4. 1901. 



Telluride, Colo., Shear 98. 

 Poa callichroa Rydb., Bull. Torrey Bot. Club. 32: 603. 1905. Dead Lake, 



near Pikes Peak, Colo., Clements 457. 

 Poa phoenicea Rydb., Bull. Torrey Bot. Club 32: 605. 1905. Pikes Peak 



Valley, Colo., Clements 466. 

 Poa tricholepis Rydb., BuU. Torrey Bot. Club 32: 606. 1905. Pagosa Peak, 



Colo., Baker 210. 

 Poa chionogenes Gandog., BuU. Soc. Bot. France 66 7 : 302. 1920. Grays 



Peak, Colo., Crandall [in 1898]. 



Colorado specimens of this species have been described as Poa cenisia All. by 

 some recent American authors. 

 (19) Poa arida Vasey, Contrib. U.S. Natl. Herb. 1: 270. 1893. Socorro, N. 



Mex., G. R. Vasey in 1881. 



Poa andina Nutt.; S. Wats., in King, Geol. Expl. 40th Par. 388. 1871. Not 

 P. andina Trin., 1836. " Colorado, East and West Humboldt Mountains 

 and in Clover Mountains, Nevada; also in the Trinity Mountains, Watson 

 1319." The name is given as P. andina " Nutt., Ms. in Herb. ; (not of Trin.) .' 



